The genus includes about 35 species [2] of monoecious trees and shrubs , a few reaching a large size, distributed throughout the north temperate zone with a few species extending into central america, as well as the northern and southern andes. Its latin name, alnus glutinosa, tips you off that this tree develops a gummy resin on new leaves and buds. Tree types grow 40 to 80 feet (12-24 m. ) tall, and include the red and white alders. The leaves of alder trees are usually simple, alternate, and can range from broadly ovate to elliptical. · the different types of alder trees include tall trees with single trunks and much shorter, multi-stemmed specimens that can be grown as shrubs. · most alders are shrub -sized to medium-sized (<10-50 ft tall), but a few species can grow to a hundred feet. The most common species of alder are red alder (alnus rubra), native to north america, and european or black alder (alnus glutinosa), which is native to europe. · here are 12 common alder trees and shrubs for your landscaping needs. The black alder gets its common name from the dark grey color of the bark in aged trees. · depending on the species, they can grow from small, multi-stemmed shrubs to tall trees up to 35 meters in height.
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